Libertarian view is essentially 1) all negative externalities are some kind of property/personal infringement, 2) the same values that urge regulation also urge

Libertarian view is essentially 1) all negative externalities are some kind of property/personal infringement, 2) the same values that urge regulation also urge externality-free purchasing preferences, 3) people free of large tax/regulatory burdens have an easier time fixing social problems, 4) sometimes the externality is worth bearing (e.g. it may be worth temporary security problems to get a billion smartphones into the developing world now.) I found these pretty easily by googling 'mises' and 'externalities' and while I could debate the specifics of the points, they seem to be just as legitimate an answer as regulation, which we know has its own negative externalities.